Draft-regulating device for boilers



"Dec. 27, 1927. 1,654,486

H. FRAUD DRAFT REGULATING DEVICE FOR BOILERS Fiied Oct. 13. 1924 fig Z- um/14km Patented Dec. 27, 1927.

UNITED STATES 3,654,486 PATENT OFFICE,

HENRI FRAUD, OF PARIS, FRANCE, ASSIGNOR T ALVIERICAN RADIATOR Cfll liyjlli Y,

015 NEW YORK, 33'. Y, A CORPORATION 'OF HEX i JERSEY.

DRAFT-REGULATING DEVICE FOR BOILERS.

Application filed October 13, 1924, Serial No. 743,364, and inFrance December, 539, 192 3.

The present invention relates to draft regulating devices for boilers of the central heat ing type, and more particularly to that type of such devices which include a thermostat adapted to be immersed in the water of the boiler and adapted. to actuate a damper for controlling, by means of suitable connecting elements, the inlet of air under the boiler grate.

The invention contemplates improvements in such regulators, whereby the connection between the thermostat and the damper is made independent to a certain degree'in such manner that should the damper be subject ed to abrupt shocks or movements, the capsule or containing vessel of the thermostat will not become damaged or incapacitated.

F or this purpose, in the preferred embodiment shown and described, the lever which is connected by a pivot axle with the upper part of the thermostat rod or plunger, or.

which is caused to: bear upon said rod by means of a weight, is simply engaged with the proper vertical play, for example in a forked portion provided upon the said rod or plunger and having disposed near the top a stop-piece co-operating with the said lever. The appended drawings show by way of example an embodiment of the invention.

Fig. 1 is a vertical section of the regulator. Fig. 2 is a plan view of the thermostat rod. The said regulator is attached to the boiler by means of adouble connecting member preferably in the form of a. nipple 1 to which is screwed a casing member 2; between these members is clamped the edge .or flange of the thermostat capsule 3; this edge being preferably made of soft metal in order to form a tight joint between the said members. The hollow rod or plunger 5 of the thermostat rests loosely at its lower end upon the movable bottom 4 of the capsule, and is provided at its upper end with a fork between whose branches 6 is engaged the inner end of the lever 7 controlling the said damper. The lever 7 is pivoted intermediate its ends on a pivot pin 7 on the casing member 2.

The thermostatic capsule comprises the inner corrugated eXpansible-collapsible element 8 and an outer container 3 forming a closed chamber to receive an expansible or volatile liquid, which upon the rise of temaerature will act to collapse the corrugated element 3.

Due to, the weight of the lever 7 and the elements which it supports, or to which it is connected at its outer portion, the inner end of the lever will be held against the stoppiece or axle 9 which traverses both branches of the fork; and this weight which tends to lift the rod 5 is balanced by vasuitable spring 8. The spring 8 is of helical coil form and is mounted on the rod 6, oneend of said spring abutting a collar or flange 5 011 said rod, and the other end abutting a face or shoulder 2 in the casing. L

When the thermostat expands or contracts by reason of ten'lperat-ure variations in the boiler, the rod 5 which is lightly pressed or rests loosely against the movable bottom t will. follow its motion, and the lever which is held against tl'iestop-piece 9 will be dis placed and will accordingly control the air inlet. damper.

Should the said damper or the lever 7 be subjected to a shock or an abrupt stress, the thermostat will remain unaifected, for in fact if the said stress should tend to lower the outer arm of the lever, the rod 5 will be raised against the action of the spring 8, without acting uponthe bottom a of the said capsule. If on the contrary the outer arm, of the lever is suddenly raised, its inner end will be released or disengaged from the stoppieceO and move downwards and will not actuate the rod 5 or thrust the latter downward, so that the thrust upon the capsule 3 will never be greater than the sum of the weight of the rod and the thrust of the spring.

By the foregoing improvements the thermostatic element will be protected against damage or danger of becoming incapacitated due to forces which may be exerted upon the lever 7, or any connections between the same and the part, for example, a damper, operated or controlled thereby.

I claim '1. A damper regulator comprising a pivoted controlling lever adapted to be connected to a damper to be controlled, a thermostat, a plunger connected operatively to said thermostat, a stop-piece on said plunger and below and against which said lever bears in an upward direction, and a spring acting on said plunger to oppose upward movement of said plunger and of said lever against said stop-piece.

2. A damper regulator comprising a piv- IOU oted controlling lever adapted to be connected to a damper to be controlled, a thermostat, a plunger connected operatively to said thermostat, a stop-piece fixed on said plunger and below and directly against which said lever bears in an upward direction, and a spring acting on said plunger to oppose upward movement of said lever against said stop-piece, said lever being movable freely downward out of engagement with said stop-piece.

3. A damper regulator comprising a controlling lever pivoted between its ends and one end of which is adapted to be connected toia' damper to be controlled, a thermostat, a plunger connected operatively to said thermostat, a stop-piece on said plunger and below and against which the other end of said lever bears in an upward direction, and a spring acting on said plunger to oppose up ward movement of said plunger and of said other end of the lever, said other end of said lever being movable i'reely downward out of engagement with said stop piece.

4. A damper regulator comprising a controlling lever pivoted between its ends and one end of which is adapted to be connected to a damper to be controlled, a thermostat, a plunger connected operatively to said thermostat to move therewith, but capable of movement upward relative to said thermostat, a stop-piece on said plunger and below and against which the other end of said lever bears in an upward direction, and a esase spring acting on said plunger to oppose upward movement of said plunger and of said other end of said lever, said other end of said lever being movable freely downward out of engagement with said stop-piece 5. A damper regulator comprising a pivoted controlling lever adapted to be 0011- nected to a damper, a thermostat, a rod pertaining thereto which is movable according to ten'iperatur-e changes, a fork disposed at the top of the said rod and having the said lever engaged therein, a stop-piece disposed at the upper part of said fork below which the said lever is caused to bear by its own gravity, a plunger having a stop-piece positi nod in the path of movement of said lever n1 said one direction, spring means acting on said plunger to oppose movement of said lever in said one direction, and a thermostat adapted to exert its :torce to'overcome said spring to permit operation of said lever by gravity.

In testimony that I claim the foregoing as my invention, I have signed my name.

HENRI FRAUD. 

